Reduction of 1/ f noise in high- T c dc superconducting quantum interference devices cooled in an ambient magnetic field

Reduction of 1/ f noise in high- T c dc superconducting quantum interference devices cooled in an ambient magnetic field

The spectral density SΦ(f ) of the low-frequency 1/f noise of high transition temperature dc superconducting quantum interference devices (SQUIDs) with narrow linewidths was independent of B0, the magnetic field in which they were cooled, up to a threshold value, about 33 μT in the best case. Above...

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Veröffentlicht in:Applied physics letters 1996-12, Vol.69 (26), p.4099-4101
Hauptverfasser: Dantsker, E., Tanaka, S., Nilsson, P.-Å., Kleiner, R., Clarke, John
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Sprache:eng
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container_end_page 4101
container_issue 26
container_start_page 4099
container_title Applied physics letters
container_volume 69
creator Dantsker, E.
Tanaka, S.
Nilsson, P.-Å.
Kleiner, R.
Clarke, John
description The spectral density SΦ(f ) of the low-frequency 1/f noise of high transition temperature dc superconducting quantum interference devices (SQUIDs) with narrow linewidths was independent of B0, the magnetic field in which they were cooled, up to a threshold value, about 33 μT in the best case. Above this threshold, which is associated with the entry of flux vortices into the film, the noise increased rapidly. By contrast, for large square washer SQUIDs, SΦ(f ) scaled linearly with B0. Estimates indicate that the 1/f flux noise produced by the pickup loop of a directly coupled magnetometer is negligible.
doi_str_mv 10.1063/1.117831
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Above this threshold, which is associated with the entry of flux vortices into the film, the noise increased rapidly. By contrast, for large square washer SQUIDs, SΦ(f ) scaled linearly with B0. 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title Reduction of 1/ f noise in high- T c dc superconducting quantum interference devices cooled in an ambient magnetic field
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